Beam-compass.



T. F. HANNAN.

BEAM COMPASS.

APPLICATION FILED rmmo, 1909.

. 972, 1 O6. Patented Oct. 4, 1910.

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- UNITED STATES PATENT OFFICE.

THOMAS F. HANNAN, OF SCHENECTADY, NEW YORK.

BEAM-COMPASS.

To all whom it may concern:

Be it known that I, THOMAS F. HANNAN", a citizen of the United States, residing at Schenectady, county of Schenectady, State of New York, have invented certain new and useful Improvements in Beam-Compasses, of which the following is a specification.

This invention relates to instruments such as beam compasses and the like and has for its object the simplification of the construction and arrangement of the parts, so that the instrument can be produced at a low cost without sacrifice as to accuracy, durability and appearance.

In carrying out my invention, I make the yoke which carries the marking element of the compass out of a single punching, the bearings for the marker being bent up or struck up from the body of the yoke. A single fastening is then provided for securing the yoke to the beam and at the same time for holding the marker in place.

In the accompanying drawing, in which I have shown my invention embodied in concrete form for purposes of illustration, Figure 1 represents a front elevation of my device; Fig. 2 represents an end view of the same; Fig. 3 represents a side and end elevation of the yoke before it is bent around the beam; Fig. 1 shows the yoke in perspective, ready to be placed upon the beam; Fig. 5 shows the fastening for the yoke and marker; and Fig. 6 shows a different form of marker attached to the yoke.

Referring to the drawings, 10 represents the bar or beam which may be of metal and of any desired form.

For purposes of illustration, I have shown the beam as having a straight edge on one side and a rounded surface on the other, although it is obvious that other forms may be used if desired. The beam has two markers mounted thereon, both having the same construction. Marker 11, which is bent so as to be eccentric, for the purpose of fine adjustment by the knurled head 11, is mounted in hearings on the yoke 12. This yoke I have formed out of a single piece, as shown in Fig. 3. It is preferably of sheet metal punched out flat and then bent or off set, as shown in Fig. 3. One of the projections 13 forming a bearing is struck up out of the Specification of Letters Patent.

Application filed February 20, 1909.

Patented Oct. 4, 1910.

Serial No. 479,193.

solid metal of the yoke and bent at right angles, as shown in Fig. 4. The other bearing 1 1 is on the end of the yoke and is bent parallel with the bearing 13. There is also a lug 15 which may be struck up from the body of the yoke between the bearings 13 and 14k to prevent the marker from being forced down against the yoke. The yoke is then bent around the beam 10, as shown, so that its ends project beyond the beam and a fastening is passed through the ends. This fastening comprises a bolt 16 having a head 17 which is drilled to receive the marker. The bolt passes through the two ends of the yoke and a knurled head nut 18 draws the two ends of the yoke together to fasten the yoke to the beam. At the same time that the yoke is fastened to the beam, the head 17 which forms the third bearing for the marker, is drawn out of line with the bearings 13 and 14: and thereby tightens the marker in place. By this arrangement it will be seen that by means of a single screw the marker may be shifted along the beam and at the same time tightened in place. The yoke is made of a single punching and requires no finishing other than the bending of the parts as shown. If desired, a pencil point 19 may be substituted for the marker 11, as shown in Fig. 6.

While I have shown my invention as constructed and arranged in a specific manner for purposes of illustration, it should be un derstood that I do not limit my invention thereto, since various modifications thereof will suggest themselves to those skilled 1n the art without departing from the spirit of my invention, the scope of which is set forth in the annexed claims.

WVhat I claim as new and desire to secure by Letters Patent of the United States, is

1. A beam compass comprising a beam, a marker, a yoke provided with bearings for the marker and bent around the beam, and a device arranged to clamp the ends of the yoke together to bind the yoke to the beam, said device being provided with a bearing for the marker movable into and out of alinement with the other bearings.

2. A beam compass comprising a beam, a marker, a yoke having bearings for the marker, one of which is struck up from the yoke intermediate its ends, bent around the In Witness whereof, I have hereunto set beam, a device passing through the ends for my hand this 13 day of February, 1909. clamping the yoke to the beam, said device i T being provided With a bearing movable into THOMAS IIANLAN' and out of alineinent With the other bear- \Vitnesses: ings as the yoke is respectively loosened and ALEX. F. MACDONALD,

tightened on the beam. RICHARD G. Povny. 

